72665780 has 96 divisors (see below), whose sum is σ = 174666240. Its totient is φ = 25159680.

The previous prime is 72665773. The next prime is 72665819. The reversal of 72665780 is 8756627.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 643004 + ... + 643116.

It is an arithmetic number, because the mean of its divisors is an integer number (1819440).

Almost surely, 2^72665780 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 72665780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87333120).

72665780 is an abundant number, since it is smaller than the sum of its proper divisors (102000460).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72665780 is a wasteful number, since it uses less digits than its factorization.

72665780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249 (or 247 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 41.

The square root of 72665780 is about 8524.4225610888. The cubic root of 72665780 is about 417.2951269915.

The spelling of 72665780 in words is "seventy-two million, six hundred sixty-five thousand, seven hundred eighty".